<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <title>Document</title>
        <script src="https://unpkg.com/react@16/umd/react.development.js"></script>
        <script src="https://unpkg.com/react-dom@16/umd/react-dom.development.js"></script>
        <script src="https://unpkg.com/babel-standalone@6.15.0/babel.min.js"></script>
    </head>
    <body>
        <div id="test"></div>
        <div id="demo"></div>
        
        <script type="text/babel">
            const VDOM = (/* 此处这里不需要写引号,因为不是字符串 */
                <h1 id="title">
                    <span>hello,react</span>
                </h1>
            )
            // 2. 渲染虚拟DOM到页面
            ReactDOM.render(VDOM,document.getElementById('test'));

            console.log('虚拟DOM',VDOM);    // 虚拟DOM Object
            console.log(typeof VDOM);   // Object
            console.log(VDOM instanceof Object);    // true
            

            const TDOM = document.getElementById('demo');
            console.log('真实dom',TDOM);    // 真实dom <div id=​"demo">​</div>​

            debugger

            /* 
                关于虚拟DOM
                    1.本质是Object类型的对象(一般对象)
                    2.虚拟DOM比较'轻',因为虚拟DOM是react内部在用,无需真实dom上那么多的属性
                    3.虚拟dom最终会被react转化为真实dom,呈现在页面上
            
            */
        </script>
    </body>
    
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